Control mechanism for gas driven welders



y 22, 1934- E. A. HOBART 1,959,674

CONTROL MECHANISM FOR GAS DRIVEN WELDERS Filed May 16, 1932 INVENTOR EDWflfiZ? 29. #081957.

ATTORNEY Patented May 22, 1934 PATENT OFFICE UNITED STATES CONTROLMECHANISM FOR GAS DRIVEN WELDERS tion of Ohio Application May 16, 1932, Serial No. 611,628

7 Claims.

My invention relates to an automatic throttle control for engines, particularly internal combustion engines; and it is my object to provide such a control in connection with are welders.

It is my object to provide an automatic throttle control for an engine which will be delayd in its action. When used in connection with an arc welder it is desired to provide a time interval after the arcis broken during which there will be no reduction in speed of the engine to give an opportunity to change electrodes, but if it is desired to 'have'the are broken for a longer interval, then the speed of the engine will be automatically cut down by an automatic adjustment of the throttle.

It is my object to eliminate the use of vacuum actuating means in this connection.

It is my object to eliminate the engine as a source of power and it is my object to eliminate the generator and its circuit as a source of power for controlling the throttle.

In particular it is my object to provide a source of power independent of both the engine and the generator for controlling the mechanism that adot the engine 19.

justs the throttle and thereby have such an adjustment accurately performed without being affected by either the engine or the generator.

Referring to the drawing, I have illustrated diagrammatically the control of my invention.

In detail, 1 indicates an exciter armature having an exciter field 2. 3 designates the welder main field while 4 designates the main field rheostat of the welder. ing a commutating field 6 and a diverter field 7. 8 is the stabilizing reactance of the welder. 9 is an ammeter and 10 is a volt meter for measuring the characteristics of performance of the welder. An electrode circuit is connected into the welder at the terminals 11. 12 indicates an electrode and 12a a work piece in circuit with the welder circuit for the purpose of arc welding.

I provide a sensitive relay 13 connected to the lines 13a and 13b into the welder circuit,whlch is a sensitive relay normally closed. The switch member affected thereby designated 14a is arranged'through the wires 14b and 14c in circuit with the battery 14. In this circuit is a throttle operating a relay comprising a coil 15, and a core 150 connected to the dash pct 16 which so regulates its movemengas to give the necessary delay in order to perm'it'bf the change of electro es before cutting down the engine speed. Connec d to the corel5a is a bell crank 1'7, one end of which has connected thereto a spring 17a. A pitman 17b connects thelbell crank 1'7 to the throttle 18 5 is the welder armature hav-' In operation the switch member 14a is held against the relay 18 so that the battery circuit from the battery 14 is open, but upon breaking the are, the switch member 14a. is held to close the battery circuit to the battery 14 and comprises a coil 15 by reason of its being in circuit.

This tends to actuate the core 15a and dash pot 16, but such actuation movement is delayed by the dash pot action for a period suflicient in time to permit of the change in electrodes. If the electrodes are changed or for some other reason the arc is re-established within a suitable time limit, the system will again be restored to arcing position, switch 140. will be open and the engine will not be slowed down.

However, if a greater delay is incurred so that the dash pot passes through a cycle of operations and ceases to retard the movement of the butterfiy valve 18, that valve will close and the engin will be shut down to idling speed.

I desire to comprehend within my invention such modifications as may be clearly embraced within the claims and scope of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In combination, a driving power source, a throttle therefor, a driven power source and a third power source for actuating the throttle, said third power source beingrendered operative by the driven power source upon the driven power source being rendered inoperative, whereby the third power source will reduce the speed of the driving power source.

2.. In combination, an engine, a generator driven thereby, a throttle on the engine, a battery and battery circuit controlling said throttle, and means operated by the generator for rendering the battery circuit inoperative while the generator is producing a welding arc and to causesaid battery'to operate the engine throttle when the generator is not producing an arc.

3. In combination, an engine, a generator driven thereby, a throttle on the engine, a battery and battery circuit controlling said throttle, and means operated by the generator forrendering the battery circuit inoperative while the generator is producing a welding arc and to cause said battery to operate the engine throttle when the generator is not producing an arc, and means of delaying that action a predetermined time after the breaking of the arc.

4. In an internal combustion engine, a throttle therefor, an independent source of power adapted to actuate said throttle, a welding generator driven by said engine, means operated by the generator of rendering said independent source of power inoperative while the generator is furnishing a welding arc and rendering it operative when it is not furnishing such a welding arc.

5. In combination in an internal combustion engine, a throttle therefor, means normally to maintain said throttle open, a dash pot connected thereto to delay the closing of the throttle, a relay for operating said throttle and dash pot, a battery for operating said relay, including a battery circuit, a switch operated by the welding generator for opening and closing said battery circuit and a welding generator circuit adapted to open said battery circuit when the generator is furnishing an arc and permit the battery circuit to close when the generator is not furnishing an arc.

6. In combination in an internal combustion engine, a throttle therefor, means normally to maintain said throttle open, a dash pot connected thereto to delay the closing of the throttle, a relay for operating said throttle and dash pot, a battery for operating said relay, including a battery circuit, a switch operated by the welding generator for opening and closing said battery circuit and a welding generator circuit adapted to open said battery circuit when the generator is furnishing an arc and permit the battery circuit to close when the generator is not furnishing an arc, said generator having associated therewith an exhaustive relay adapted to actuate said battery circuit switch.

7. In combination, an internal combustion engine, a throttle therefor normally open, electrically operated means for closing said throttle, a dash pot for resisting said closing and an independent electric power source for actuating said throttle closing means, a switch therefor operated by the welding generator, a welding generator and its circuit for producing an'arc, a relay circuit associated with the welding generator cirwhen the generator is furnishing an arc.

EDWARD A. HOBART. 

